Clark County commissioner Steve Sisolak received dozens of calls Thursday morning after tweeting that the Raiders had filed for relocation to move to Las Vegas, the latest step in southern Nevada’s campaign to gain an NFL team.

Many of the callers wanted to know where they could buy season tickets.

“One guy wanted to have a parade,” said Sisolak.

But Vegas officials aren’t ready to celebrate with so many hurdles still to clear in a complicated move that needs a solid financial stadium plan and NFL backing before it happens.

The Raiders now must seek the approval of 24 of 32 owners before proceeding. A vote could happen in late March at league meetings in Phoenix.

“They’re committed,” Sisolak said of the Raiders. “Now it’s up to the NFL.”

A Raiders official confirmed the filing without comment.

But East Bay officials didn’t let the latest development dampen their hopes of keeping the football team in Oakland. An investment group including former 49ers and Raiders star Ronnie Lott has proposed to build a $1.25 billion, 55,000-seat stadium at the team’s present site.

“We are ready to compete,” Oakland mayor Libby Schaaf said. “We know that Oakland offers something that Las Vegas will never have and that is legacy and loyalty.”

The mayor said the NFL plans to meet with Oakland officials to allow the home market to pitch a proposal from the Fortress Investment group. The city, county and Lott’s group agreed to a term sheet in December. They are working on an exclusive negotiation agreement that needs city and county approval. After the agreement is OK’d the investors can create a more detailed plan.

“The more we work on this project, the more convinced we are that Oakland is the right place for the Raiders,” said Sam Singer, a Fortress Group spokesman.

“We are in this game and we are playing to win,” said Sam Singer, a spokesman for the Fortress investment group that includes Lott. “The more we work on this project, the more convinced we are that Oakland is the right place for the Raiders.”

Alameda County Supervisor Scott Haggerty said Thursday it would be a mistake for Davis to move. The board president said the estimated $500 million in NFL relocation fee “far exceeds what they are being offered in Las Vegas.”

Haggerty added, “I think it would be a bad business deal to leave a TV market in the top 10. We all saw what happened in San Diego. They too will get the same backlash here. I think they’ll get a certain amount of fans that will follow them to Las Vegas but there will be a lot of fans that will not.”

Las Vegas, which will join the major professional sports scene next season with an NHL expansion team, is ranked as the country’s 41st largest media market. Southern Nevada officials say the metropolitan area of 2.1 million people is ready to support pro sports leagues. They also are trying to win a Major League Soccer franchise.

The area has shown how serious it is about wooing the Raiders with a proposed $1.9 billion stadium deal that includes $750 million from a hotel tax approved by lawmakers and signed by Gov. Brian Sandoval.

Securing a solid financial plan remains a key component in getting the proposed 65,000-seat domed stadium built for 2020. The current plan includes a $650-million contribution from the Adelson family, which owns the Sands casino, and $500 million from the Raiders and the NFL.

The relationship with billionaire Sheldon Adelson, however, remains perhaps the biggest hurdle because NFL rules prohibit casino owners from having an ownership stake in a team. The Adelson family wants a percentage of the Raiders as part of the stadium deal.

Raiders officials told NFL owners last week that they have secured a commitment from global investment giant Goldman Sachs if they can’t reach an agreement with Adelson. But it is unclear how and why Goldman Sachs would help finance such a project, or whether the commitment simply means the investment banker is confident it could lure another third-party investor.

If the move to Las Vegas becomes a reality, the Raiders would play in Oakland until their new stadium is ready, said Jeremy Aguero, whose economic, fiscal and policy research firm is helping guide the Clark County Stadium Authority board members.

He added the team might play some preseason games at 40,000-seat Sam Boyd Stadium, which is home to Nevada-Las Vegas’ football team.

The stadium board has scheduled a meeting next Thursday for a briefing on what lies ahead.

Check back for updates.

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David DeBolt is a reporter for the Bay Area News Group who covers Oakland. DeBolt grew up in the Bay Area and has worked for daily newspapers in Palo Alto, Fairfield and Walnut Creek. He joined the organization in 2012.

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